K-Fed Confused by Green Mystery Substance

2/27/2010 2:00 AM PST BY TMZ STAFF
Kevin Federline visited a grocery store in Los Angeles on Friday and seemed to struggle to recognize a box of leafy greens.

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We're told K-Fat was shopping for healthy foods with his girlfriend Victoria Prince -- but still managed to suck down a cancer stick on his way out of the store.

Baby steps.